There have been a few questions that are answerable but to do so would invoke Sensitive Security Information. While some SSI has made its way into public knowledge and someone determined to know these things probably can, should we allow these questions (and the potential of someone answering them) on this site?
A current example is this question which asks if it is possible to bluff your way onto an airline jumpseat. Given inside knowledge of procedures and what a flight crew would expect from a jumpseater, someone could probably pull this off, but I don't think this type of knowledge is appropriate for this site. Right now this question has some close votes for "opinion based", and I added a VTC for off-topic, as that is my opinion of this type of question. What do you think?